Girls: Can you help me, please?

My girlfriend is 24 and the sweetest girl ever. She is very classy, soft spoken, and I just love being around her. The thing is, she told me one thing she has wanted to do for a long time is to get her nipples pierced. I couldn't imagine her ever thinking about something like that. She said a couple of her friends did it back in college, but she didn't want to be topless too and be getting it done, and she thought people would look down on her. If she wants to get them done, I really want her to do it, and feel sexy as hell when she looks down and sees them pierced. Life is too short not to do something you want to do. She is worried that they might pop out and people will notice them, but I don't think so? Am I being a bad boyfriend by encouraging her to do it?